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滩涂土壤电磁感应仪与方差四叉树法采样布局研究（Application of Electromagnetic Induction (EM38) and Variance Quad-tree (VQT) Method on Spatial Sampling Scheme in Coastal Saline Region）
电磁感应仪 方差四叉树 滩涂
2010/12/28
将电磁感应仪EM38和方差四叉树法VQT相结合，以EM38测量的土壤表观电导率作为土壤盐分的辅助变量，以表观电导率的空间分布为先验信息，利用VQT法对苏北滩涂围垦地土壤盐分的优化采样布局进行了设计、验证与精度评价。结果表明，VQT法设计的采样方案经Kriging插值形成的空间分布图与原始图件极其相似，但两者的样点数目相差近1/2。相同的样本数目，VQT法获取的空间分布图与原始图件的相似度高于网格采...
基于Bayes方法的节水灌溉产品质量抽样检验方案研究（Study and Application on Sampling Test Plan of Water-saving Irrigation Products Based on Bayes Method）
节水灌溉 产品质量 抽样检验 Bayes方法
2010/4/1
利用节水灌溉产品质量抽样检验先期数据和经验，构建基于Bayes方法的节水灌溉产品质量抽样检验方案，利用该方案对塑料管材和滴灌灌水器以及旋转式喷头进行产品质量检验的新样本抽样。结果表明，产品检验样本量降低率E主要与先验产品合格率方差S2R和先验产品合格率均值Ra有关，对小于1200的常用产品批量，S2R=0.002和Ra=0.95下的塑料管材和滴灌灌水器以及旋转式喷头的产品检验样本量降低率分别高于6...
Sampling Design for Global Scale Mapping and Monitoring of Agriculture
Global Agriculture Sampling Stratification Crop Monitoring MERIS
2016/4/8
In the changing global environment there is a need for an operational system for monitoring of world food crop production using satellite observations. It is useful in two primary missions – food secu...
Important findings of the sampling survey conducted on farms in the CR under Phare ACE project
transformation process farm restructuring farm categories individual farms household members farm as legal entities financial situation realization of products production industries prospects of production expansion
2014/3/28
The paper is based on a special sampling survey of farms that was conducted under EU PHARE ACE research project P97-8158-R “Micro-economic Analysis of Farm Restructuring in Central and Eastern Europe”...